1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file 32bpp_base.hpp Base for all 32 bits blitters. */
#ifndef BLITTER_32BPP_BASE_HPP
#define BLITTER_32BPP_BASE_HPP
#include "base.hpp"
#include "../core/bitmath_func.hpp"
#include "../core/math_func.hpp"
#include "../gfx_func.h"
/** Base for all 32bpp blitters. */
class Blitter_32bppBase : public Blitter {
public:
/* virtual */ uint8 GetScreenDepth() { return 32; }
/* virtual */ void *MoveTo(void *video, int x, int y);
/* virtual */ void SetPixel(void *video, int x, int y, uint8 colour);
/* virtual */ void DrawRect(void *video, int width, int height, uint8 colour);
/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
/* virtual */ int BufferSize(int width, int height);
/* virtual */ void PaletteAnimate(const Palette &palette);
/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
/* virtual */ int GetBytesPerPixel() { return 4; }
/**
* Look up the colour in the current palette.
*/
static inline Colour LookupColourInPalette(uint index)
{
return _cur_palette.palette[index];
}
/**
* Compose a colour based on RGBA values and the current pixel value.
*/
static inline Colour ComposeColourRGBANoCheck(uint r, uint g, uint b, uint a, Colour current)
{
uint cr = current.r;
uint cg = current.g;
uint cb = current.b;
/* The 256 is wrong, it should be 255, but 256 is much faster... */
return Colour(
((int)(r - cr) * a) / 256 + cr,
((int)(g - cg) * a) / 256 + cg,
((int)(b - cb) * a) / 256 + cb);
}
/**
* Compose a colour based on RGBA values and the current pixel value.
* Handles fully transparent and solid pixels in a special (faster) way.
*/
static inline Colour ComposeColourRGBA(uint r, uint g, uint b, uint a, Colour current)
{
if (a == 0) return current;
if (a >= 255) return Colour(r, g, b);
return ComposeColourRGBANoCheck(r, g, b, a, current);
}
/**
* Compose a colour based on Pixel value, alpha value, and the current pixel value.
*/
static inline Colour ComposeColourPANoCheck(Colour colour, uint a, Colour current)
{
uint r = colour.r;
uint g = colour.g;
uint b = colour.b;
return ComposeColourRGBANoCheck(r, g, b, a, current);
}
/**
* Compose a colour based on Pixel value, alpha value, and the current pixel value.
* Handles fully transparent and solid pixels in a special (faster) way.
*/
static inline Colour ComposeColourPA(Colour colour, uint a, Colour current)
{
if (a == 0) return current;
if (a >= 255) {
colour.a = 255;
return colour;
}
return ComposeColourPANoCheck(colour, a, current);
}
/**
* Make a pixel looks like it is transparent.
* @param colour the colour already on the screen.
* @param nom the amount of transparency, nominator, makes colour lighter.
* @param denom denominator, makes colour darker.
* @return the new colour for the screen.
*/
static inline Colour MakeTransparent(Colour colour, uint nom, uint denom = 256)
{
uint r = colour.r;
uint g = colour.g;
uint b = colour.b;
return Colour(r * nom / denom, g * nom / denom, b * nom / denom);
}
/**
* Make a colour dark grey, for specialized 32bpp remapping.
* @param r red component
* @param g green component
* @param b blue component
* @return the brightness value of the new colour, now dark grey.
*/
static inline uint8 MakeDark(uint8 r, uint8 g, uint8 b)
{
/* Magic-numbers are ~66% of those used in MakeGrey() */
return ((r * 13063) + (g * 25647) + (b * 4981)) / 65536;
}
/**
* Make a colour grey - based.
* @param colour the colour to make grey.
* @return the new colour, now grey.
*/
static inline Colour MakeGrey(Colour colour)
{
uint r = colour.r;
uint g = colour.g;
uint b = colour.b;
/* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then
* divide by it to normalize the value to a byte again. See heightmap.cpp for
* information about the formula. */
uint grey = ((r * 19595) + (g * 38470) + (b * 7471)) / 65536;
return Colour(grey, grey, grey);
}
static const int DEFAULT_BRIGHTNESS = 128;
static Colour ReallyAdjustBrightness(Colour colour, uint8 brightness);
static inline Colour AdjustBrightness(Colour colour, uint8 brightness)
{
/* Shortcut for normal brightness */
if (brightness == DEFAULT_BRIGHTNESS) return colour;
return ReallyAdjustBrightness(colour, brightness);
}
};
#endif /* BLITTER_32BPP_BASE_HPP */
|
